please very soon full explanation K H D U D C M are the prefixes used when converting measures in the ……….. system to the ……….. system . The two blanks should be (a) metric to metric (b) metric to English (c) English to English (d) English to metric (e) none of these
The Correct Answer and Explanation is:
The correct answer is: (a) metric to metric
Explanation
The prefixes K, H, D, U, D, C, M are used when converting between units within the metric system. These letters represent standard metric prefixes that denote powers of ten. Here is what each letter stands for:
- K – Kilo (1,000 units)
- H – Hecto (100 units)
- D – Deka (10 units)
- U – Unit (such as meter, liter, or gram)
- D – Deci (0.1 units)
- C – Centi (0.01 units)
- M – Milli (0.001 units)
These prefixes help in converting from one metric unit to another by simply shifting the decimal point. For example, to convert 2 kilometers to meters, you multiply by 1,000 because “kilo” means 1,000. So, 2 kilometers equals 2,000 meters. Similarly, to convert 500 milliliters to liters, you divide by 1,000, because “milli” means 1/1,000. So, 500 milliliters is 0.5 liters.
This system is not used when converting between metric and English systems (also called the imperial system). English units such as inches, feet, pounds, and gallons do not follow this decimal-based structure. Instead, conversions between metric and English systems require specific equivalencies such as 1 inch equals 2.54 centimeters or 1 pound equals approximately 0.4536 kilograms.
Because the prefixes K, H, D, and so on are unique to the metric system and facilitate internal conversions, they apply only when converting metric units to other metric units. Therefore, the correct choice is (a) metric to metric.
Other options are incorrect because:
- (b) and (d) refer to conversions between metric and English systems, which do not use these prefixes.
- (c) refers to conversions within the English system, which also does not use decimal-based prefixes.
- (e) is incorrect as option (a) is valid.
